Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
  • C08L1/08—Cellulose derivatives
  • C08L1/10—Esters of organic acids, i.e. acylates
  • C08L1/12—Cellulose acetate
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
  • C08L1/08—Cellulose derivatives
  • C08L1/10—Esters of organic acids, i.e. acylates
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/04—Oxygen-containing compounds
  • C08K5/13—Phenols; Phenolates
  • C08K5/134—Phenols containing ester groups
  • C08K5/1345—Carboxylic esters of phenolcarboxylic acids
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/49—Phosphorus-containing compounds
  • C08K5/51—Phosphorus bound to oxygen
  • C08K5/52—Phosphorus bound to oxygen only
  • C08K5/521—Esters of phosphoric acids, e.g. of H3PO4
  • C08K5/523—Esters of phosphoric acids, e.g. of H3PO4 with hydroxyaryl compounds
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/49—Phosphorus-containing compounds
  • C08K5/51—Phosphorus bound to oxygen
  • C08K5/52—Phosphorus bound to oxygen only
  • C08K5/524—Esters of phosphorous acids, e.g. of H3PO3
  • C08K5/526—Esters of phosphorous acids, e.g. of H3PO3 with hydroxyaryl compounds
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/49—Phosphorus-containing compounds
  • C08K5/51—Phosphorus bound to oxygen
  • C08K5/52—Phosphorus bound to oxygen only
  • C08K5/527—Cyclic esters
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2201/00—Properties
  • C08L2201/02—Flame or fire retardant/resistant

Definitions

• the present invention relates to a cellulose ester-based resin composition and a molded article thereof.
• Synthetic resins such as polyesters, polyamides and polycarbonates are used as materials that constitute, for example, electrical and electronic devices such as personal computers, printers and copying machines; home electric appliances such as televisions and refrigerators; packaging materials such as containers and packages; building materials such as wall and flooring materials; and automobile interior and exterior materials.
• These synthetic resins have excellent moldability, productivity and mechanical properties; however, since they are produced using petroleum as raw material, when they are disposed in nature, their low decomposability imposes a large stress to the environment such as soil.
• incineration of these synthetic resins leads to generation of carbon dioxide and thus presents a problem from the standpoint of preventing global warming.
• plant-derived resins have excellent biodegradability and thus do not put much stress to the soil environment.
• these resins are, in the first place, synthesized by photosynthetic reaction performed by plants using carbon dioxide and water in the atmosphere as raw materials, even if they are incinerated and carbon dioxide is consequently generated, the balance of carbon dioxide in the atmosphere stays even; therefore, these plant-derived resins are regarded as so-called “carbon-neutral” materials. From the standpoint of preventing global warming, it is urgent to replace petroleum-derived resins with such carbon-neutral plant-derived resins.
• a cellulose derivative As a plant-derived resin, a cellulose derivative has been utilized.
• cellulose esters such as cellulose acetate, cellulose acetate propionate, cellulose acetate butyrate and cellulose acetate phthalate have been conventionally used.
• these cellulose derivatives such as cellulose esters have poor moldability by themselves and they also have a problem in terms of the processability.
• these cellulose derivatives are thermally molded by injection molding or the like, it is necessary to add a plasticizer thereto.
• the cellulose esters are colored during processing and molding, there is a problem in terms of the color tone of a molded article obtained therefrom.
• Patent Documents 1 and 2 It has been proposed to add a phosphate as the plasticizer (Patent Documents 1 and 2). However, the processability and the moldability are largely different depending on kinds of phosphates, and satisfactory performance has not been attained. In addition, it is considered necessary to solve the coloration problem. Furthermore, there is still room for improvement with respect to the heat resistance.
• cellulose derivatives such as cellulose esters are demanded to have flame retardancy as well.
• Patent Document 1 Japanese Unexamined Patent Application Publication No. 2006-28429
• Patent Document 2 Japanese Unexamined Patent Application Publication No. 2006-176596
• a first object of the present invention is to provide a cellulose ester-based resin composition having excellent processability, resistance to coloration caused by processing and flame retardancy.
• a second object of the present invention is to provide a molded article having excellent color tone and flame retardancy, which is obtained from the cellulose ester-based resin composition.
• a phosphate having a specific structure shows excellent processability, resistance to coloration and heat resistance and that a cellulose ester-based resin composition having excellent processability, resistance to coloration caused by processing and flame retardancy can be obtained by incorporating such a phosphate into a cellulose ester resin composition, thereby completing the present invention.
• the cellulose ester-based resin composition of the present invention is characterized by comprising 1 to 50 parts by mass of a phosphate represented by the following Formula (1) with respect to 100 parts by mass of a cellulose ester-based resin:
• R 1 and R 2 each independently represent a hydrogen atom or a methyl group; and n represents an integer of 1 to 5).
• the cellulose ester-based resin composition of the present invention further comprise at least one selected from the group consisting of a phenol compound represented by the following Formula (2), a triaryl phosphite compound represented by the following Formula (3) and a diaryl pentaerythritol diphosphite compound represented by the following Formula (4), each in an amount of 0.01 to 10 parts by mass with respect to 100 parts by mass of the above-described cellulose ester-based resin:
• R 3 represents an alkyl group having 1 to 4 carbon atoms; m represents an integer of 1 to 4; and A represents a residue of a mono- to tetra-hydric alcohol from which m hydroxyl groups are removed);
• R 4 and R 5 each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms
• R 6 and R 7 each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
• the molded article of the present invention is characterized in that it is obtained by molding the above-described cellulose ester-based resin composition.
• a cellulose ester-based resin composition having excellent processability, resistance to coloration caused by processing and flame retardancy as well as a molded article having excellent color tone and flame retardancy can be provided.
• cellulose ester-based resin examples include cellulose organic acid esters such as cellulose acetate, cellulose propionate, cellulose butyrate, cellulose acetate propionate and cellulose acetate butyrate; derivatives of these cellulose organic acid esters, including grafts such as polycaprolactone-grafted cellulose acetate; organic acid ester ethers of cellulose, including C2 to C6 acyl cellulose-C1 to C6 alkyl ethers such as acetyl methyl cellulose, acetyl ethyl cellulose and acetyl propyl cellulose, and C2 to C6 acyl cellulose hydroxy-C2 to C6 alkyl ethers such as acetyl hydroxyethyl cellulose and acetyl hydroxypropyl cellulose; cellulose inorganic acid esters such as cellulose nitrate, cellulose sulfate and cellulose phosphate; and cellulose organic-inorganic mixed acid esters,
• cellulose ester-based resins cellulose organic acid esters are preferred.
• Cellulose esters of a carboxylic acid having 2 to 6 carbon atoms are more preferred, and cellulose acetate is particularly preferred.
• the cellulose ester-based resin composition of the present invention comprises a phosphate represented by the following Formula (1):
• R 1 and R 2 each independently represent a hydrogen atom or a methyl group; and n represents an integer of 1 to 5).
• the above-described phosphate represented by the Formula (1) may be used individually, or two or more thereof may be used in combination.
• Examples of the phosphate represented by the Formula (1) include the following Compound Nos. 1 and 2.
• n an integer of 1 to 5
• the method of synthesizing the phosphate represented by the Formula (1) is not particularly restricted and, for example, it can be synthesized by allowing 4,4′-dihydroxybiphenyl, phenol and phosphorus oxychloride to react with each other in the presence of a catalyst such as magnesium chloride and subsequently subjecting the resultant to dehydrochlorination, or by a transesterification reaction between triphenyl phosphate and 4,4′-dihydroxybiphenyl.
• the amount of the phosphate represented by the Formula (1) in the cellulose ester-based resin composition of the present invention is 1 to 50 parts by mass, preferably 5 to 40 parts by mass, more preferably 10 to 35 parts by mass, with respect to 100 parts by mass of the cellulose ester-based resin.
• the cellulose ester-based resin composition of the present invention further comprise at least one selected from the group consisting of a phenol compound represented by the below-described Formula (2), a triaryl phosphite compound represented by the below-described Formula (3) and a diaryl pentaerythritol diphosphite compound represented by the below-described Formula (4), each in an amount of 0.01 to 10 parts by mass with respect to 100 parts by mass of the cellulose ester-based resin.
• R 3 represents an alkyl group having 1 to 4 carbon atoms; m represents an integer of 1 to 4; and A represents a residue of a mono- to tetra-hydric alcohol from which m hydroxyl groups are removed).
• Examples of the alkyl group having 1 to 4 carbon atoms which is represented by R 3 in the Formula (2) include methyl, ethyl, propyl, isopropyl, butyl, sec-butyl, tert-butyl and isobutyl.
• the mono- to tetra-hydric alcohol yielding the residue represented by A in the Formula (2) is preferably a mono- to tetra-hydric alcohol having 1 to 30 carbon atoms.
• monohydric alcohols such as methanol, ethanol, butanol, octanol, 2-ethylhexanol, decanol, dodecanol, tridecanol, isotridecanol, tetradecanol, hexadecanol, octadecanol, eicosanol, docosanol, and triacontanol; dihydric alcohols such as ethylene glycol, diethylene glycol, triethylene glycol, thiodiethanol, propylene glycol, butylene glycol, neopentyl glycol, 1,6-hexanediol, 1,10-decanediol, 2,2-bis(4-(2-hydroxyethoxyl)pheny
• phenol compound represented by the Formula (2) include stearyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, hexamethylene-bis-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, thiodiethylene-bis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate), 3,6-dioxaoctane-1,8-bis(3-(3-tert-butyl-5-methyl-4-hydroxyphenyl)propionate), 2,2-bis(4-(2-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxy)ethyl)phenyl)propane, 3,9-bis(1,1-dimethyl-2-(3-(3-tert-butyl-5-methyl-4-hydroxyphenyl)propionyloxy)ethyl)2,4,8,10
• R 4 and R 5 each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms).
• Examples of the alkyl group having 1 to 4 carbon atoms which is represented by R 4 and R 5 in the Formula (3) include methyl, ethyl, propyl, isopropyl, butyl, sec-butyl, tert-butyl and isobutyl.
• triaryl phosphite compound represented by the Formula (3) include tris(2-tert-butylphenyl)phosphite, tris(2,4-di-tert-butylphenyl)phosphite, tris(2,5-di-tert-butylphenyl)phosphite, tris(2-tert-butyl-4-methylphenyl)phosphite, tris(2-tert-butyl-5-methylphenyl)phosphite and tris(2-tert-butyl-4,6-dimethylphenyl)phosphite, among which tris(2,4-di-tert-butylphenyl)phosphite is particularly preferred.
• R 6 and R 7 each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
• Examples of the alkyl group having 1 to 4 carbon atoms which is represented by R 6 and R 7 in the Formula (4) include methyl, ethyl, propyl, isopropyl, butyl, sec-butyl, tert-butyl and isobutyl.
• diaryl pentaerythritol diphosphite compound represented by the Formula (4) include bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, bis(2,6-di-tert-butylphenyl)pentaerythritol diphosphite, bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite, bis(2,6-di-tert-butyl-4-ethylphenyl)pentaerythritol diphosphite, bis(2,6-di-tert-butyl-4-isopropylphenyl)pentaerythritol diphosphite, bis(2,4,6-tri-tert-butylphenyl)pentaerythritol diphosphite, bis(2,6-di-tert-butyl
• diaryl pentaerythritol diphosphite compounds bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite and bis(2,4,6-tri-tert-butylphenyl)pentaerythritol diphosphite are particularly preferred.
• the total content of these three components is preferably 0.01 to 10 parts by mass, more preferably 0.05 to 5 parts by mass, with respect to 100 parts by mass of the cellulose ester-based resin.
• the total content is less than 0.01 parts by mass, the desired coloration-inhibiting effect may not be attained during processing, while when the total content is greater than 10 parts by mass, enhancement of the effect corresponding to the content may not be attained.
• a plasticizer may be used arbitrarily.
• the plasticizer include phthalate-based plasticizers such as dibutyl phthalate, butylhexyl phthalate, diheptyl phthalate, dioctyl phthalate, diisononyl phthalate, diisodecyl phthalate, dilauryl phthalate, dicyclohexyl phthalate and dioctyl terephthalate; adipate-based plasticizers such as dioctyl adipate, diisononyl adipate, diisodecyl adipate and di(butyldiglycol)adipate; phosphate-based plasticizers such as triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, tri(isopropylphenyl)phosphate, triethyl phosphate, tribu
• a variety of additives such as a phosphorus-based, phenol-based or sulfur-based antioxidant, an ultraviolet absorber and a hindered amine-based light stabilizer can also be incorporated.
• Examples of the above-described phosphorus-based antioxidant include triphenyl phosphite, tris(nonylphenyl)phosphite, tris(dinonylphenyl)phosphite, tris(mono-, di-mixed nonylphenyl)phosphite, bis(2-tert-butyl-4,6-dimethylphenyl).ethyl phosphite, diphenyl acid phosphite, 2,2′-methylene-bis(4,6-di-tert-butylphenyl)octyl phosphite, diphenyldecyl phosphite, phenyldiisodecyl phosphite, tributyl phosphite, tris(2-ethylhexyl)phosphite, tridecyl phosphite, trilauryl phosphite, dibut
• phenol-based antioxidant examples include 2,6-di-tert-butyl-p-cresol, 2,6-diphenyl-4-octadesiloxyphenol, distearyl(3,5-di-tert-butyl-4-hydroxybenzyl)phosphonate, tridecyl.3,5-di-tert-butyl-4-hydroxybenzyl thioacetate, 4,4′-thiobis(6-tert-butyl-m-cresol), 2-octylthio-4,6-di(3,5-di-tert-butyl-4-hydroxyphenoxy)-s-triazine, 2,2′-methylene-bis(4-methyl-6-tert-butylphenol), bis[3,3-bis(4-hydroxy-3-tert-butylphenyl)butyric acid]glycol ester, 4,4′-butylidene-bis(4,6-di-tert-butylphenol), 2,2′-
• sulfur-based antioxidant examples include dialkyl thiodipropionates such as dilauryl thiodipropionate, dimyristyl thiodipropionate, myristylstearyl thiodipropionate and distearyl thiodipropionate; and ⁇ -alkylmercaptopropionates of polyols, such as pentaerythritol tetra( ⁇ -dodecylmercaptopropionate).
• dialkyl thiodipropionates such as dilauryl thiodipropionate, dimyristyl thiodipropionate, myristylstearyl thiodipropionate and distearyl thiodipropionate
• ⁇ -alkylmercaptopropionates of polyols such as pentaerythritol tetra( ⁇ -dodecylmercaptopropionate
• Examples of the above-described ultraviolet absorber include 2-hydroxybenzophenones such as 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-tert-butyl-4′-(2-methacryloyloxyethoxyl)benzophenone and 5,5′-methylene-bis(2-hydroxy-4-methoxybenzophenone); 2-(2-hydroxyphenyl)benzotriazoles such as 2-(2-hydroxy-5-methylphenyl)benzotriazole, 2-(2-hydroxy-5-tert-octylphenyl)benzotriazole, 2-(2-hydroxy-3,5-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-(2-hydroxy-3-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole, 2-(2-hydroxy-3-dodecyl-5-methylphenyl)benzotriazole, 2-(
• hindered amine-based light stabilizer examples include 2,2,6,6-tetramethyl-4-piperidyl stearate, 1,2,2,6,6-pentamethyl-4-piperidyl stearate, 2,2,6,6-tetramethyl-4-piperidyl benzoate, bis(2,2,6,6-tetramethyl-4-piperidyl)sebacate, bis(1,2,2,6,6-pentamethyl-4-piperidyl)sebacate, bis(1-octoxy-2,2,6,6-tetramethyl-4-piperidyl)sebacate, tetrakis(2,2,6,6-tetramethyl-4-piperidyl)-1,2,3,4-butane tetracarboxylate, tetrakis(1,2,2,6,6-pentamethyl-4-piperidyl)-1,2,3,4-butane tetracarboxylate, bis(2,2,6,6-tetramethyl-4-piperidyl
• a flame retardancy-imparting additive(s) usually incorporated in synthetic resins for example, a triazine ring-containing compound, a metal hydroxide, a phosphate-based flame retardant, a condensed phosphate-based flame retardant, an inorganic phosphorus-based flame retardant, a (poly)phosphate-based flame retardant, a halogen-based flame retardant, a silicon-based flame retardant, an antimony oxide such as antimony trioxide, other inorganic flame retardant aid, other organic flame retardant aid and/or an anti-dripping agent, may also be added.
• a triazine ring-containing compound for example, a metal hydroxide, a phosphate-based flame retardant, a condensed phosphate-based flame retardant, an inorganic phosphorus-based flame retardant, a (poly)phosphate-based flame retardant, a halogen-based flame retardant, a silicon-based flame retardant, an antimony
• triazine ring-containing compound examples include melamine, ammeline, benzoguanamine, acetoguanamine, phthalodiguanamine, melamine cyanurate, melamine pyrophosphate, butylene diguanamine, norbornene diguanamine, methylene diguanamine, ethylene dimelamine, trimethylene dimelamine, tetramethylene dimelamine, hexamethylene dimelamine and 1,3-hexylene dimelamine.
• metal hydroxide examples include magnesium hydroxide, aluminum hydroxide, calcium hydroxide, barium hydroxide, zinc hydroxide and KISUMA 5A (magnesium hydroxide: manufactured by Kyowa Chemical Industry Co., Ltd.).
• phosphate-based flame retardant examples include trimethyl phosphate, triethyl phosphate, tributyl phosphate, tributoxyethyl phosphate, trischloroethyl phosphate, trisdichloropropyl phosphate, triphenyl phosphate, tricresyl phosphate, cresyldiphenyl phosphate, trixylenyl phosphate, octyl diphenyl phosphate, xylenyl diphenyl phosphate, trisisopropylphenyl phosphate, 2-ethylhexyl diphenyl phosphate, t-butylphenyl diphenyl phosphate, bis-(t-butylphenyl)phenyl phosphate, tris-(t-butylphenyl)phosphate, isopropylphenyl diphenyl phosphate, bis-(isopropylphenyl dipheny
• Examples of the above-described condensed phosphate-based flame retardant include 1,3-phenylene-bis(diphenylphosphate), 1,3-phenylene-bis(dixylenylphosphate) and bis-phenol A-bis(diphenylphosphate).
• Examples of the above-described (poly)phosphate-based flame retardant include ammonium salts and amine salts of polyphosphoric acids, such as ammonium polyphosphate, melamine polyphosphate, piperazine polyphosphate, melamine pyrophosphate and piperazine pyrophosphate.
• Examples of the above-described other inorganic flame retardant aid include inorganic compounds such as titanium oxide, aluminum oxide, magnesium oxide, hydrotalcites, talc and montmorillonite, and surface-treated products thereof.
• inorganic compounds such as titanium oxide, aluminum oxide, magnesium oxide, hydrotalcites, talc and montmorillonite, and surface-treated products thereof.
• inorganic compounds such as titanium oxide, aluminum oxide, magnesium oxide, hydrotalcites, talc and montmorillonite, and surface-treated products thereof.
• TIPAQUE R-680 titanium oxide: manufactured by Ishihara Sangyo Kaisha, Ltd.
• KYOWAMAG 150 magnesium oxide: manufactured by Kyowa Chemical Industry Co., Ltd.
• DHT-4A hydrotalcite: manufactured by Kyowa Chemical Industry Co., Ltd.
• ALCAMIZER 4 zinc-modified hydrotalcite: manufactured by Kyowa Chemical Industry Co., Ltd.
• Examples of the above-described other organic flame retardant aid include pentaerythritol.
• the anti-dripping agent examples include fluorine-containing anti-dripping agents, for example, fluorocarbon resins such as polytetrafluoroethylene, polyvinylidene fluoride and polyhexafluoropropylene; and alkali metal perfluoroalkanesulfonate compounds and alkaline earth metal perfluoroalkanesulfonate compounds, such as sodium perfluoromethane sulfonate, potassium perfluoro-n-butane sulfonate, potassium perfluoro-t-butane sulfonate, sodium perfluorooctane sulfonate and calcium perfluoro-2-ethylhexane sulfonate.
• fluorine-containing anti-dripping agents for example, fluorocarbon resins such as polytetrafluoroethylene, polyvinylidene fluoride and polyhexafluoropropylene; and alkali metal perfluoroalkane
• the additives normally used in a synthetic resin to impart flame retardancy are incorporated in an amount of preferably 0.05 to 5 parts by mass with respect to 100 parts by mass of the cellulose ester-based resin.
• additives normally used in synthetic resins for example, an antistatic agent, a cross-linking agent, an anti-fogging agent, an anti-plate-out agent, a surface treatment agent, a lubricant, a fluorescent agent, an antifungal agent, an antibacterial agent, a foaming agent, a metal inactivator, a mold-release agent, a pigment and a processing aid, may also be incorporated in such a range that does not impair the effects of the present invention.
• Examples thereof include a method in which the materials to be incorporated are separately added to the resin and the resultant is then mixed using a Henschel mixer or the like before being fed to a processing machine; a method in which an arbitrary combination of the materials other than the resin is prepared in advance as a mixture and this mixture is then made into the form of powder or granules before being added to the resin; a method in which the materials to be incorporated is added to the resin at a high concentration to prepare a masterpellet and this masterpellet is added to the resin; and a method in which, using an extruder having a plurality of feed ports, the materials to be incorporated are added to the resin through a feed port different from the one through which the resin is fed.
• a cellulose ester-based resin molded article By molding the cellulose ester-based resin composition of the present invention, a cellulose ester-based resin molded article can be obtained.
• the molding method is not particularly restricted, and examples thereof include extrusion processing, calender processing, injection molding, rolling, compression molding and blow molding. Molded articles having various shapes, such as resin plates, sheets, films, fibers and special shape articles, can be thereby produced.
• a molded article obtained from the cellulose ester-based resin composition of the present invention has excellent color tone and flame retardancy.
• the cellulose ester-based resin composition of the present invention and a molded article thereof can be used in a wide range of industrial fields, including the fields of electric/electronic/communication, agriculture/forestry/fisheries, mining, construction, food, fiber, clothing, health care, coal, petroleum, rubber, leather, automobiles, precision instruments, lumber, building materials, civil engineering, furnitures, printing and musical instruments.
• the cellulose ester-based resin composition of the present invention and a molded article thereof can also be used in other various applications, including materials of automobiles, vehicles, ships, airplanes, buildings and houses as well as materials for construction and civil engineering, such as seats (stuffing, cover materials and the like), belts, ceiling cover, convertible tops, armrests, door trims, rear package trays, carpets, mats, sun visors, wheel covers, mattress covers, air-bags, insulating materials, straps, strap belts, wire coating materials, electric insulating materials, paints, coating materials, veneer materials, floor materials, baffle walls, wallpapers, wall decorating materials, exterior materials, interior materials, roof materials, deck materials, wall materials, pillar materials, floor boards, fence materials, framing and moulding materials, window and door-shaped materials, shingle boards, sidings, terraces, balconies, soundproof boards, thermal insulating boards and window materials; and household articles and sporting goods, such as clothing materials, curtains, sheets, nonwoven fabrics, plywood boards, synthetic fiber boards,
• Each cellulose ester-based resin composition was prepared in accordance with the respective formulations shown in Tables 1 and 2 below.
• the thus obtained cellulose ester-based resin was kneaded under the below-described test conditions to examine the processability and the resistance to coloration caused by processing.
• the processability was evaluated based on the torque measured during the kneading and the resistance to coloration caused by processing was evaluated in the below-described manner.
• the phosphate compound-1 is a mixture of compounds having different values of n.
• n represents a number of 1 to 5
• phenol compound-1 triaryl phosphite compound-1 and diaryl pentaerythritol diphosphite compound-2 were used as a phenol compound represented by the above-described Formula (2), a triaryl phosphite compound represented by the above-described Formula (3) and a diaryl pentaerythritol diphosphite compound represented by the above-described Formula (4), respectively.
• comparative compounds the following comparative phosphate compound-1 and comparative phosphate compound-2 were used.
• Apparatus uniaxial extruder (LABOPLASTOMILL 75C-100: trade name, manufactured by Toyo Seiki Seisaku-sho, Ltd.)
• Processing temperature 230° C.
• each cellulose ester-based resin composition After kneading for 10 minutes each cellulose ester-based resin composition, the color thereof was visually examined and evaluated based on the following criteria.
• Each cellulose ester-based resin composition was prepared in accordance with the respective formulations shown in Table 3 below.
• the thus obtained cellulose ester-based resin composition was extruded under the below-described processing conditions to produce a pellet, which was subsequently injection-molded at 240° C. to obtain a 1.6 mm ⁇ 12.7 mm ⁇ 127 mm test piece for flame retardancy test.
• the thus obtained test piece was subjected to the UL-94V flame retardancy test performed by the below-described method.
• Processing temperature 230 to 240° C.
• test piece of 127 mm in length, 12.7 mm in width and 1.6 mm in thickness was held vertically and a burner flame was brought into contact with the lower end of the test piece for 10 seconds. Then, the flame was removed and the time required for the flame ignited on the test piece to be extinguished was measured. Next, simultaneously with the flame extinction, a flame was again brought into contact with the test piece for the second time for 10 seconds, and the time required for the flame ignited on the test piece to be extinguished was measured in the same manner as in the first measurement. Further, at the same time, it was also evaluated whether or not a piece of cotton placed under the test piece was ignited by cinders falling from the test piece.
• the phosphate compound represented by the Formula (1) has superior heat resistance as compared to the existing phosphate compounds.

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